Hi Bill, The non-US model, or the modified US model only needs 10w to drive the 1.3 to full output. I also Ave a k3/1.3 combo and 9W gives me legal out on at least a couple bands, 1200-1400w out all other bands.. I also have an ic7800 for rig 2 and that drives the 1.3 to fiI'll output with 9W as well. 73 Darrell AB2E
Sent via the Samsung GALAXY S® 5, an AT&T 4G LTE smartphone -------- Original message -------- From: Bill Frantz <fra...@pwpconsult.com> Date: 9/10/17 5:10 PM (GMT-04:00) To: elecraft@mailman.qth.net Subject: [Elecraft] K3 and Expert 1.3K-FA amplifier power I have just set up an Expert 1.3K-FA amplifier with my K3 (with most of the upgrades to become a K3S). My question is, when I drive it with 10W set on the K3 output power, it shows a drive level of about 30W and and output level of 950W. What is going on? Details: The two boxes are connected with about 6' of RG-58 for the RF and a custom cable made by KC5PCB, Dan Tassell for the rest of the signals. The output is into a dummy load, although very similar measurements occur with my trapped vertical antenna. Tests were in the CW portion of the 20M band. The Amp is powered from a dedicated 120V circuit which shows a 7 volt drop at 12.7A during CW key down transmission. (Voltage is measured by a Fluke 87 DVM and current by a Kill-A-Watt PA4400.) An external YS-60 power meter shows 800W, which seems reasonable agreement given the accuracy of RF power measurements. Why does the K3 show 10W and the amp show 30W? Is there something screwy here, or is it normal? 73 Bill AE6JV ------------------------------------------------------------------------- Bill Frantz | The first thing you need when | Periwinkle (408)356-8506 | using a perimeter defense is a | 16345 Englewood Ave www.pwpconsult.com<http://www.pwpconsult.com> | perimeter. | Los Gatos, CA 95032 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to a...@hotmail.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
